Sewing machine main shaft bearing



Sept. 14, 1937. L. e. BOWMAN SEWING MACHINE MAIN SHAF T BEARING Original Filed Sept. 27, 1935 Laws 6. BOWMAN "I I ll I I I l Q .U-

I I l I Patented Sept. 14, 1937 UNITED STATES 2,093,030 I snwme mourns MAIN sum BEARING Louis G. Bowman, St. Louis, Mo., assignor to Lewis Invisible Stitch Machine Company, St. Louis, Mo., a corporation of Maine Original application September 27, 1935, Serial No. 42,547. Divided and this application April 20, 1936, Serial No. 75,483

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This invention relates to new and useful improvements in sewing machines generally, although more particularly to the bearing for the main shaft thereof.

This application constitutes a division of my copending application Serial No. 42,547, filed Sept. 27, 1935, for improvements in Sewing machines.

The principal object of the invention is to provide a main bearing for the main shaft and a spaced or extended bearing for the projecting end portion of the shaft whereby said end portion of the shaft which carries driving eccentrics will be adequately supported against any bending strain of the shaft.

With the above and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawing.

In the drawing:

Figure 1 is a rear elevation of a sewing machine embodying my invention, and

Figure 2 is a perspective view of the extended bearing.

Like reference numerals designate corresponding parts throughout the several figures of the drawing.

The sewing machine to which I have applied my invention includes a base 5, a standard 8, and a laterally extending arm I to the free end of which is removably secured a sewing head I.

A main shaft 8 is journaled in spaced main bearings l2 and ii, the bearing I! being located at the upper end of the standard and the hearing I! being elongated and located at the free end of the arm 1. The bearing I3 comprises a sleeve or bushing which is fixedly mounted in the abutting walls 'I'- and 8* of the arm 1 and head 8 by set screws It. The shaft 9 extends beyond the end of the arm I into the stitching head 8, and mounted on said extending end of the shaft are the usual eccentrics l5, l6 which drive the needle shaft and the top feed respectively, and a gear I! which drives the hook shaft it, the gear I! being located adjacent the extreme end of the shaft and the eccentrics l5, It being located between and spaced from the bearing II and the sear ii.

If this driving end of the shaft were not supported in a bearing, a bending strain would be imparted thereto and the driving connections would be affected accordingly. I have therefore provided a supplemental bearing I! which is spaced from and in alinement with the hearing I! and integrally connected to the latter by a U- shaped yoke 20. The eccentrics l5, ii are located within the yoke 20 and the gear I1 is located beyond said yoke.

From the foregoing, it will be seen that I have provided a U-shaped bearing extension having a shaft bearing in each leg of the U; that the inner bearing is formed by a hub or sleeve boss which is mounted in the abutting walls 1, 8 of the frame arm I and the head 8, and that the base of the U is directed upwardly to provide clearance for the driving eccentrics i5 and I 6.

It is of course to be understood that the details of structure and arrangement of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim:

1. In a sewing machine, the combination with a frame including an arm and a sewing head attached by a wall to said arm, of a main shaft rotatably supported in the arm and projecting into said head, and a U-shaped shaft bearing unit removably located in said head and having a. shaft receiving bearing in each leg of the U, one of said bearings constituting a hub mounted in said wall.

2. In a sewing machine, the combination with a frame including an arm and a sewing head attached by a wall to said arm, of a'main shaft rotatably supported in the arm and projecting into said head, and a U-shaped shaft bearing unit re- I movably located in the head with the base of the U directed upwardly into the upper portion of said head, one leg of the U having a shaft bearing to receive the projecting end of the shaft and the other leg of the U having a bearing for said shaft formed by an elongated sleeve boss extension mounted in said wall.

3. In a sewing machine, the combination with a frame including a laterally extending arm and a stitching head attached to the free end of said arm, the meeting ends of the arm and head including abutting walls, of a main bearing sleeve fixed in said walls, a main shaft extending along the arm and journaled in said bearing sleeve and having its end portion projecting into the stitching head, a U-shaped extension rigidly connected to the main bearing sleeve and located within said head, a supplemental bearing mounted in the extension for the extended end of the shaft,

and a driving element fixed to the shaft intermediate the main bearing and the supplemental bearing.

IDUIS G. BOWMAN. 

